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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b4b58e3213d7993e5bb1831104491a175b78b79a703b56ff4fbcb5e0694225' 
  AND token = 'o0PnhjDqpp9ltd42u57hjz87Y3H0ajELznxOAP6SjuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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