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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8347408bd4f164268cc7b6cdd1b0024f63b65ddb2924b3a3c34b60e0b570cb' 
  AND token = '3825Q+/urz+qd5StxaEaLzCuVPmNYvFJvD9ox0Ei+lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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