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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ca33063db89f13fffd08ae7cc4bd59fc7b7e33839ccf97536efe5e7ea35499' 
  AND token = 'mtV7kb3RqL/qXcs3nOREV9J7BYaJhCL4TXlA3ZP81B4=' 
  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"
    }
  }
}