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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48788af14e8fc380e3c14d8cc9cff07524efe68bfc1836ed87fb314ce1db6fad' 
  AND token = '4rc8EMkIcO+EMF9niEE0lprK/KqtgPZgQVe8Ge4DxHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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