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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e02eebad24a386550aef352e9f9d0609c90b2e2168c19d29b994f12629a93a' 
  AND token = 'MqYuGpNd7jD9lQ1M3RXzp6aaaeC9EXt4LiewQFykqUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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