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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1057d79a3fb983f25602006519e4f74edd67f272f8921e0b287e908c6b43a2' 
  AND token = 'E55QB1mSAm2uDtVVu4cGuhQD2SS+v1baGkazVKZDBxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}