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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df142f8b469be54ef201b4128daaad80dd4ba3348ee86ad0a2905175e41e65b2' 
  AND token = 'k/5iHDar/TSoidslgi0BVdnhHDcqoXI97ingZ6tG1vk=' 
  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"
    }
  }
}