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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e6bcfa4cce16a20c34481860449314b79376919cc1afe8a568d0e2f5d0bb20' 
  AND token = 'VX0HAol3+zxB6Aqo/W5Pnfa1dROURchGFU6l1PXTuQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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