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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdcf45c027de900d6aba6b4fcc6cded5b5d331f2c29e645c2e0d3839de18097' 
  AND token = 'KaeGyzg/k0wrqTmFkIh195As8oiU1aczbno0nIMkNhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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