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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8621ad0b0c6cec3342c64e4e5923fd2475a989fd51dd9d38e762b4f76e381e3c' 
  AND token = 'fcfb9wIjpWnZs+8Sym2zsxQlk+0BlyWtdkGJ0JnVf9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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