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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b3a2ba2466c0bae342215edabec2ae7eb922494fdf7857a48f3a5e3c569e61' 
  AND token = 'C9LWVCU1CnzvKhQQkQOmZKLio6gvATa58Tk9uCv8pc4=' 
  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"
    }
  }
}