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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84471dcced41a9c09cf16456e2d76ed1df862a76b4a7b9ca943c5449f9a57c03' 
  AND token = 'pQ1A2X4NJVKX0tqvAkql7fZSLoibQDtonmLo92bPSrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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