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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82568ad020920b8388efd1b118a28baa773101b9520ecb662bff0d7e6989dd75' 
  AND token = 'frdh1wmJvlfWai1O9Thji6hS2ZOFydzFJb34iRSpA58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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