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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01661371401f6d49b7ac7ea7a71a5497606018f26d20c607bcdecff5661a13b' 
  AND token = 'ZnrBivwkOrQjMLAPV50J34s6P94EERcjv5W8DJmuato=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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