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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b17b42f1ec0e13aba77636a01e553f572cf356caeff20e625ce751546d7a173' 
  AND token = 'dcS/Lr9H+ybXsf/A2nNuvYXCOpf07KCWsh2P8ZJTo54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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