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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6430e07f4a24e4f87aa573756fbcec5cb23739cc5beb806e373c5ff38828e827' 
  AND token = 'hdYVwLoYZ8tmYEdgI2rGQCP8YAQdzwUmY2DF6PS75L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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