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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1deeb26c0d34add0f1fd69d4b5f6bcd250a6fa8c79f06b5246bd061bcd0c8fa' 
  AND token = 'I8mkTFCt3yXGQrPwccvbt72n8NjreBBSSaT2o9TP0KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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