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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4569083160943f05953d8388059b8fe46f49470d5ac724e4498b02ee8f4a7f' 
  AND token = 'MV6BgHSEuKEFrIOMWZX0T4SS76dtSEEXQpbQnrfqdIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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