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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37561533940eec0ebaac56ffc254f71f4ffde518bf80e59018d50ad31325515c' 
  AND token = '3cXyaBAEy7fHuB9zO6/xr5kZvbkeBx8wLT7vJ2Und9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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