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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d660dd700e84352e19c53e47eaa6f1892a1c2502f8a4e7e058b778878dfa29f' 
  AND token = 'O144eH9d8uOJs4m0EifIC7e9WPYafzmKEP4kq4S/USs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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