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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7251179c6cce3c73b95448826264f77863c9ba89559916e94d277946a51c9e' 
  AND token = 'p8XO1nrevev04AeRgbb6GFCSjuLCULhuE17BMKRUAAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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