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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb349d6bd07d6404e88a88c374662a454144e28a6b191da6b350418c93b82c80' 
  AND token = 'CMwQrKTvWGV7kQo1O59s4xOj8Ly/jyd86QSc8mG5WB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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