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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3734a8c46cc042e88e97cae033d16513beed46c0af26106a793711cc1c44f81' 
  AND token = 'RFf7cn+vrJdjk8U3auAvpPRyilNXg+u3M1KDWGaC2VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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