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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224159444185c0e4b20990e918a713a3cda4c08b0291117728996681be569222' 
  AND token = 'SckS0e6jH7BxgxImAb35peBsM2ifyQE9TqD+3E0ENhM=' 
  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"
    }
  }
}