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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9778a5a2e36dc0603534c67161aaba3d9f1234e8e45e155d3625dc981b8c7ff' 
  AND token = 'AKiuONsZ8CpM6XqzjK8aHq2dEEqODYOEhIsqU9fRt00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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