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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc849bdf13c34f7dd037e710b2b9fc2e7e526e9c21e3dad557d556f30c62c5d' 
  AND token = 'dOOw1TnqgHbk03UipQSZF4/3zHfTAsGVn0S63Dtwd1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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