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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38db587e63d44d2513b8dfcd4739a733a7acec0387308d0284cd32922db00881' 
  AND token = '9JGP+MAn6Z4n3fKDTw21LGISFdCsLnz/cT+sX2tS2DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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