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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e9a98cf2a337647769e158ac363fa8326efc3154285f1582cbc6b689295fb3' 
  AND token = 'tAK3Dh9nLdBV9P3UL00Q24H5ig/nZ1jo44dgAqpw12s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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