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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c8db8ae9b44cc887cf0e73b7c3d7251f84734b22fdf70a610df1a12d343a1f' 
  AND token = 'hQcbNXTXALToii8tC6vqVHsfZhzb7hZ9riqU/z5EHLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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