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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60848ec357458e4a6c13e75eec8ef0dc206bfdb54755696840a794c87a9df541' 
  AND token = '9VShj0qol0FpV+VRc+yRnx/js4W1ogPkx3gK8jBx7V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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