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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470c96c033ef537312287e437d23f60b238c0186a7841c3065c8f43c2f147bc7' 
  AND token = 'EkQYCwK/2pMrlO7B6x5060Y7vOj0GKYv3F/4wVRztSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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