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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8b37c5b7bf5f27614fdb12e9bcb2dbc43959dd236e4ace335bb10292cdbf1c' 
  AND token = '5pFTB9yGaQ8i51rh5mpTYPt6Wauj71EXLki0pQoHFic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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