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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78deee0aa5b8c31df2d91198d946614f8126497a3d92e6e43708e3dedd6e2cd0' 
  AND token = 'EQSmEPTfIHgjcGH2SkXkpJN4moLleycpY1e5nWLYqwQ=' 
  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"
    }
  }
}