SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bbffd16b9b9f10a0e6b90e89672228f9302e60403ba7784a60fd71c8993065' 
  AND token = 'X7Lz5vJCRLUVmIj8tbdERgpkDCUaXvQOYXZzK38j0Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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