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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe068f09c699f921df180f1287812ac9d2858b7536b3dc90db8f86ce8920c87' 
  AND token = 'YkCP2txsvGdarydI2JboC61YhnwogSrRbvxyUGQ+I+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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