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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6449b783a84611b8b53d976320c9d4cd5e459dd65d5b91ab7f44e8366dc608bb' 
  AND token = 'DCvirytgT2ZSWO7ZUTPk1IwXVFsazRZpbNLtOOtKi40=' 
  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"
    }
  }
}