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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f51c08399c2a2197be3e8520f8ddef646e974517050abd44911d33cdcc993e' 
  AND token = 'juY2iD8oAdoS8FVCfQybJaRFEJ2V1kBoGJl1tRAVunM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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