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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b35992a8b8fb3228c28fb20ae507a89cf5b363ebde716f72b64ddab7d02df1f' 
  AND token = '8cpFaZ6Q6zJMAaUSv2MCl4ngcD0Vjn4wN2mFwkITwmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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