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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340cf9820623140dd25e10d02e4b0bcf563e525051a8692558e314cfe1210297' 
  AND token = 'DigmqEOkci5Mm5xZ6Mb2YAuKa73QC4dc7jEit9td5Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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