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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c3846a4ab2e54c408690bfe594d6b713ffc7a2d1a09e0bc6e106a361c72997' 
  AND token = '2Ies+m4ASHyXSG29FGZ9lp266ArIlWubkqT4z8FbWEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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