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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f3d31b20ba1e225d75b5cbb7ed7069462806faddb5b5e1461a4ee73ae32627' 
  AND token = 'bGfvTSUvVHZmFsHpjNhbLASk4Cp3eq09oHA7QIS+e4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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