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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff256252dd41269d087ff76d0c2b9f103e31471e1068017d23db2d69687d3c45' 
  AND token = 'iO/wdfd5Q/1I/HJOhYTFmb5Qrvt4bZ1UhuIPv4UwSoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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