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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f482f28c704795eb592b3af01594675708b358e6a9f19164a95422a48441af' 
  AND token = 'XzdJQAswWyiyAQojmcVmM5RW6K9ozJxDfxAA5djn1C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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