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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24bbb9c9aa511bb6bf6949427ffe590716b1ab6a3e27e72ceb1a35b3bcd2fb1' 
  AND token = 'z85wy7loBHPiQ182Wf1MFM1sjCiuiB7nt6CYrOYvIW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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