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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358565f033cb335580cd9d8d59f145c39a8151f0f5c537614416163420d72bc0' 
  AND token = 'KQPKrBuuD4R6ZmebLHBCYfhcpmxevysNakgLR9wDM24=' 
  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"
    }
  }
}