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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717567f0d5d66e00d05f6edd57d4d9e3048f698c8709d630393d6ca73d1bc8e8' 
  AND token = '2iTjljp8dMl3s73alD9N02lB/LPKBpRCIRFz5nwQJAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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